c++: add fixed testcases [PR98614, PR104802]

Tested on x86_64-pc-linux-gnu, pushed to trunk.

-- >8 --

Both of these PRs are fixed by r12-1403-gc4e50e500da7692a.

	PR c++/98614
	PR c++/104802

gcc/testsuite/ChangeLog:

	* g++.dg/cpp1z/nontype-auto22.C: New test.
	* g++.dg/cpp2a/concepts-partial-spec14.C: New test.

gcc/testsuite/g++.dg/cpp1z/nontype-auto22.C

@@ -0,0 +1,17 @@
+// PR c++/104802
+// { dg-do compile { target c++17 } }
+
+template<auto const& ... Args>
+struct S {
+  template<typename=void>
+  void operator()() const {}
+};
+
+struct weird_ {
+  int operator&() const { return 123; }
+} const weird {};
+
+int main() {
+  S<weird> s {};
+  s();
+}

gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec14.C

@@ -0,0 +1,10 @@
+// PR c++/98614
+// { dg-do compile { target c++20 } }
+
+template<class T>
+struct A;
+
+template<class T> requires true
+struct A<T> {
+  A(A<T> const&) = default;
+};